Oxygen sensor



FIG. 1 is a top and front perspective view of an oxygen sensor showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a bottom plan view;

FIG. 4 is a rear elevational view; and

FIG. 5 is a front elevational view thereof. 

The ornamental design for an oxygen sensor, as shown and described. 